In a good cause / Isaac Asimov -- Time piece / Joe Haldeman -- Inhuman error / Fred Saberhagen -- Early bird / Theodore R. Cogswell & Theodore L. Thomas -- Inside straight / Poul Anderson -- Superiority / Arthur C. Clarke -- Steel brother / Gordon R. Dickson -- City of yesterday / Terry Carr -- When I was Red Rover / Dean Ing -- Field test / Keith Laumer -- Chips on distant shoulders / Hal Clement -- Couldn't we all just be dear, dear friends / Keith Laumer -- An alien sort of war / Katherine MacLean -- World of the wars / Jon Freeman -- Outguessing the unknown: psychological aspects of future war / Alan E. Nourse -- The wizard warriors: computers and robots in future warfare / G. Harry Stine -- Encased in the amber of fate / Robert Frazier